During the Korean War, the United States military deployed the M1951 Flak Jacket across the Korean Peninsula to safeguard infantry units from pervasive mortar and artillery shrapnel. This protective vest combined overlapping panels of woven nylon fabric with internal pockets holding rigid aluminum or Doron fiberglass inserts. The design proved highly effective, successfully preventing over 60 percent of potentially fatal torso wounds caused by low-velocity artillery fragments.

The distinct, heavy silhouette of the flak jacket became a hallmark of Korean War journalism and combat poetry. This material realities colored the work of frontline soldier-poets, who depicted the vest as a synthetic second skin that underscored the stark mechanization of modern geopolitical conflicts.